<!-- DTD for CommonMark xml export format -->

<!ENTITY % block
         'block_quote|list|code_block|html|paragraph|heading|thematic_break|custom_block'>
<!ENTITY % inline
         'text|softbreak|linebreak|code|inline_html|emph|strong|link|image|custom_inline'>

<!ELEMENT document (%block;)*>

<!-- block elements -->

<!ELEMENT block_quote (%block;)*>

<!ELEMENT list (item)+>
<!ATTLIST list
          type (bullet|ordered) #REQUIRED
          start CDATA #IMPLIED
          tight (true|false) #REQUIRED
          delimiter (period|paren) #IMPLIED>

<!ELEMENT item (%block;)*>

<!ELEMENT code_block (#PCDATA)>
<!ATTLIST code_block
          xml:space CDATA #FIXED "preserve"
          info CDATA #IMPLIED>

<!ELEMENT html (#PCDATA)>
<!ATTLIST html
          xml:space CDATA #FIXED "preserve">

<!ELEMENT paragraph (%inline;)*>

<!ELEMENT heading (%inline;)*>
<!ATTLIST heading
          level (1|2|3|4|5|6) #REQUIRED>

<!ELEMENT thematic_break  EMPTY>

<!ELEMENT custom_block (%block;)*>
<!ATTLIST custom_block
          on_enter CDATA #IMPLIED
          on_exit CDATA> #IMPLIED>

<!-- inline elements -->

<!ELEMENT text (#PCDATA)>

<!ELEMENT softbreak EMPTY>

<!ELEMENT linebreak EMPTY>

<!ELEMENT code (#PCDATA)>
<!ATTLIST code
          xml:space CDATA #FIXED "preserve">

<!ELEMENT inline_html (#PCDATA)>
<!ATTLIST inline_html
          xml:space CDATA #FIXED "preserve">

<!ELEMENT emph (%inline;)*>

<!ELEMENT strong (%inline;)*>

<!ELEMENT link (%inline;)*>
<!ATTLIST link
          destination CDATA #REQUIRED
          title CDATA #IMPLIED>

<!ELEMENT image (%inline;)*>
<!ATTLIST image
          url CDATA #REQUIRED
          title CDATA #IMPLIED>

<!ELEMENT custom_inline (%inline;)*>
<!ATTLIST custom_inline
          on_enter CDATA #IMPLIED
          on_exit CDATA> #IMPLIED>


<!-- All elements can have a sourcepos attribute.
     The format is SL:SC-EL:EC
     where SL = number of starting line (first line = 1)
           EL = number of ending line
           SC = number of starting column (first column = 1)
           EC = number of ending column
-->
<!ATTLIST ANY sourcepos CDATA #IMPLIED>